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iOS小技能:文件预览、分享


前言

应用场景:文件下载、打印

iOS小技能:文件预览、分享_bundle

I 第三方SDK分享文件

iOS小技能:文件预览、分享_数据_02

1.1 微信SDK

/**

enum WXScene {

WXSceneSession = 0,
WXSceneTimeline = 1,
WXSceneFavorite = 2,
};

文件真实数据内容
* @note 大小不能超过10M
*/
@property (nonatomic, retain) NSData *fileData;

*/
- (void)sendFileContent
{
WXMediaMessage *message = [WXMediaMessage message];
message.title = @"ML.pdf";
message.description = @"Pro CoreData";
[message setThumbImage:[UIImage imageNamed:@"res2.jpg"]];

WXFileObject *ext = [WXFileObject object];
ext.fileExtension = @"pdf";
NSString* filePath = [[NSBundle mainBundle] pathForResource:@"ML" ofType:@"pdf"];
ext.fileData = [NSData dataWithContentsOfFile:filePath];
//+ (nullable instancetype)dataWithContentsOfURL:(NSURL *)url;
message.mediaObject = ext;

SendMessageToWXReq* req = [[[SendMessageToWXReq alloc] init]autorelease];
req.bText = NO;
req.message = message;
req.scene = WXSceneSession;

[WXApi sendReq:req completion:nil];
}

1.2 友盟SDK

#pragma
/*! @brief 多媒体消息中包含的文件数据对象
*
* @see UMShareObject
*/
@interface UMShareFileObject : UMShareObject

/** 文件后缀名
* @note 长度不超过64字节
*/
@property (nonatomic, retain) NSString *fileExtension;

/** 文件真实数据内容
* @note 大小不能超过10M
*/
@property (nonatomic, retain) NSData *fileData;

/** 文件的名字(不包含后缀)
* @note 长度不超过64字节
*/
@property (nonatomic, retain) NSString *fileName;


@end

II 原生API的文件预览及其他应用打开

- (BOOL)presentOptionsMenuFromRect:(CGRect)rect inView:(UIView *)view animated:(BOOL)animated;
- (BOOL)presentOptionsMenuFromBarButtonItem:(UIBarButtonItem *)item animated:(BOOL)animated;

// Bypasses the menu and opens the full screen preview window for the item at URL. Returns NO if the item could not be previewed.
// Note that you must implement the delegate method documentInteractionControllerViewControllerForPreview: to preview the document.
- (BOOL)presentPreviewAnimated:(BOOL)animated;//预览文件

// Presents a menu allowing the user to open the document in another application. The menu
// will contain all applications that can open the item at URL.
// Returns NO if there are no applications that can open the item at URL.
- (BOOL)presentOpenInMenuFromRect:(CGRect)rect inView:(UIView *)view animated:(BOOL)animated;//包括快速预览菜单、打印、复制
- (BOOL)presentOpenInMenuFromBarButtonItem:(UIBarButtonItem *)item animated:(BOOL)animated;//不包括包括快速预览菜单

  1. 获取NSURL

//方式1:
NSString* filePath = [[NSBundle mainBundle] pathForResource:@"ML" ofType:@"pdf"];
NSURL *url = [NSURL fileURLWithPath:filePath];
// 方式2
//NSURL *url = [[NSBundle mainBundle] URLForResource:@"ML" withExtension:@"pdf"];

  1. 实例化UIDocumentInteractionController

UIDocumentInteractionController *documentController = [UIDocumentInteractionController interactionControllerWithURL:url];
documentController.delegate = self;//UIDocumentInteractionControllerDelegate

2.1 预览文件

YES]; // 预览文件

iOS小技能:文件预览、分享_文件下载_03

2.2 文件分享

CGRect rect = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);


[documentController presentOptionsMenuFromRect:rect inView:self.view animated:YES];//包括快速预览菜单、打印、复制

// [documentController presentOpenInMenuFromRect:rect inView:self.view animated:YES];//不包括包括快速预览菜单

iOS小技能:文件预览、分享_iOS_04

2.3 控制是否显示copy、 print、saveToCameraRoll

#pragma


- (UIViewController *)documentInteractionControllerViewControllerForPreview:(UIDocumentInteractionController *)interactionController{

return self;

}


//
/**
print: saveToCameraRoll: copy:

*/
- (BOOL)documentInteractionController:(UIDocumentInteractionController *)controller canPerformAction:(SEL)action{
NSLog(@"canPerformAction %s %@ ", __func__,NSStringFromSelector(action));
//NSStringFromSelector(_cmd) //当前选择器的名字




// return NO;不显示copy print
return YES;//显示copy print

}


- (BOOL)documentInteractionController:(UIDocumentInteractionController *)controller performAction:(SEL)action{
NSLog(@"canPerformAction %s", __func__);

return YES;//显示copy print

// return NO;

III 案例

3.1 文件下载和预览

void)openfile:(CRMfilePreviewCellM*)m{




// NSURL *relativeToURL = [NSURL URLWithString:m.url ];//必须先下载,否则无法查看文件内容

[SVProgressHUD showWithStatus:@"加载中..."];

NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:m.url]];
[SVProgressHUD dismiss];


if(data== nil){

[SVProgressHUD showInfoWithStatus:@"文件下载失败"];

return ;
}





// //用单例类 NSFileManager的对象,将文件写入本地
NSFileManager *fileManage = [NSFileManager defaultManager];

NSString *tmp = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject];
// NSString *tmp = NSTemporaryDirectory();

NSString *fileName = m.fileName;

tmp =[tmp stringByAppendingPathComponent:fileName];


BOOL isSuccess = [fileManage createFileAtPath:tmp contents:data attributes:nil];




if(isSuccess){



NSURL *url = [NSURL fileURLWithPath:tmp];




UIDocumentInteractionController *documentController = [UIDocumentInteractionController interactionControllerWithURL:url];
//UIDocumentInteractionController delegate must implement documentInteractionControllerViewControllerForPreview: to allow preview
documentController.delegate = self;//UIDocumentInteractionControllerDelegate


[documentController presentPreviewAnimated:YES]; // 预览文件

}





}

#pragma


- (UIViewController *)documentInteractionControllerViewControllerForPreview:(UIDocumentInteractionController *)interactionController{

return self;

}


//
/**
print: saveToCameraRoll: copy:

*/
- (BOOL)documentInteractionController:(UIDocumentInteractionController *)controller canPerformAction:(SEL)action{
NSLog(@"canPerformAction %s %@ ", __func__,NSStringFromSelector(action));
//NSStringFromSelector(_cmd) //当前选择器的名字




// return NO;不显示copy print
return YES;//显示copy print

}


- (BOOL)documentInteractionController:(UIDocumentInteractionController *)controller performAction:(SEL)action{
NSLog(@"canPerformAction %s", __func__);

return YES;//显示copy print

// return NO;

3.2 使用数据模型保存下载文件路径

懒加载

//        NSURL *relativeToURL = [NSURL URLWithString:m.url ];//必须先下载,否则无法查看文件内容
- (NSString *)filePathFromUrl{

if(_filePathFromUrl !=nil){
return _filePathFromUrl;

}


NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:self.url]];

if(data== nil){

[SVProgressHUD showInfoWithStatus:@"文件下载失败"];

return nil;

}




// //用单例类 NSFileManager的对象,将文件写入本地
NSFileManager *fileManage = [NSFileManager defaultManager];

NSString *tmp = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject];
// NSString *tmp = NSTemporaryDirectory();

NSString *fileName = self.fileName;


tmp =[tmp stringByAppendingPathComponent:fileName];


BOOL isSuccess = [fileManage createFileAtPath:tmp contents:data attributes:nil];

_filePathFromUrl = tmp;

if(!isSuccess){

_filePathFromUrl = nil;


}
return

预览文件

void)openfile:(CRMfilePreviewCellM*)m{


if(!m.filePathFromUrl){
return;

}

NSURL *url = [NSURL fileURLWithPath:m.filePathFromUrl];

UIDocumentInteractionController *documentController = [UIDocumentInteractionController interactionControllerWithURL:url];
//UIDocumentInteractionController delegate must implement documentInteractionControllerViewControllerForPreview: to allow preview
documentController.delegate = self;//UIDocumentInteractionControllerDelegate


[documentController presentPreviewAnimated:YES]; // 预览文件

3.3 使用数据模型分享文件

iOS小技能:文件预览、分享_文件下载_05

@property (nonatomic,copy) NSString *fileName;

@property (nonatomic,copy) NSString *url;
//
@property (nonatomic,copy) NSString *filePathFromUrl;

/**

/** 文件真实数据内容
* @note微信文件分享 大小不能超过10M
*/
@property (nonatomic, retain) NSData *fileData;

- (void)sendFileContent;



- (NSData *)fileData{
if(_fileData==nil){

NSString* filePath= [self filePathFromUrl];
_fileData =[NSData dataWithContentsOfFile:filePath];

}
return _fileData;

}

- (void)sendFileContent
{
WXMediaMessage *message = [WXMediaMessage message];
message.title = self.fileName;

message.description =self.fileName;

[message setThumbImage:[UIImage imageNamed:self.iconName]];


WXFileObject *ext = [WXFileObject object];

ext.fileExtension =self.fileExtension;


ext.fileData =self.fileData;

//+ (nullable instancetype)dataWithContentsOfURL:(NSURL *)url;
message.mediaObject = ext;

SendMessageToWXReq* req = [[SendMessageToWXReq alloc] init];



req.bText = NO;
req.message = message;
req.scene = WXSceneSession;

[WXApi sendReq:req completion:nil];



}

3.4 清理缓存

获取沙盒缓存路径

+ (nullable NSString *)userCacheDirectory {
NSArray<NSString *> *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
return

清理沙河文件缓存

- (void)removeAllData {
[self.fileManager removeItemAtPath:self.diskCachePath error:nil];
[self.fileManager createDirectoryAtPath:self.diskCachePath
withIntermediateDirectories:YES
attributes:nil
error:NULL];
}

清理WKWebView的缓存

+ (void)clearWebCacheCompletion:(dispatch_block_t)completion {
if (@available(iOS 9.0, *)) {
NSSet *websiteDataTypes = [WKWebsiteDataStore allWebsiteDataTypes];
NSDate *dateFrom = [NSDate dateWithTimeIntervalSince1970:0];
[[WKWebsiteDataStore defaultDataStore] removeDataOfTypes:websiteDataTypes modifiedSince:dateFrom completionHandler:completion];
} else {
NSString *libraryDir = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES)[0];
NSString *bundleId = [[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleIdentifier"];
NSString *webkitFolderInLib = [NSString stringWithFormat:@"%@/WebKit",libraryDir];
NSString *webKitFolderInCaches = [NSString stringWithFormat:@"%@/Caches/%@/WebKit",libraryDir,bundleId];
NSString *webKitFolderInCachesfs = [NSString stringWithFormat:@"%@/Caches/%@/fsCachedData",libraryDir,bundleId];

NSError *error;
/* iOS8.0 WebView Cache path */
[[NSFileManager defaultManager] removeItemAtPath:webKitFolderInCaches error:&error];
[[NSFileManager defaultManager] removeItemAtPath:webkitFolderInLib error:nil];

/* iOS7.0 WebView Cache path */
[[NSFileManager defaultManager] removeItemAtPath:webKitFolderInCachesfs error:&error];
if

清理图片缓存

+(void)clearCache:(NSString *)path{
NSFileManager *fileManager=[NSFileManager defaultManager];
if ([fileManager fileExistsAtPath:path]) {
NSArray *childerFiles=[fileManager subpathsAtPath:path];
for (NSString *fileName in childerFiles) {
//如有需要,加入条件,过滤掉不想删除的文件
NSString *absolutePath=[path stringByAppendingPathComponent:fileName];
[fileManager removeItemAtPath:absolutePath error:nil];
}
}
// [[SDImageCache sharedImageCache] cleanDisk];

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